Motor with reduced torque ripple

A torque-ripple-reduced NB-phase permanent magnet synchronous motor, comprising:

• a stator including a protruding structure, wherein a single winding of the stator is looped through a single tooth, a number of stator teeth is greater than or equal to (NB+2), each of the teeth of the stator has a composite winding looped by windings of two or more phases, a position in a direction of rotor rotation of each of the teeth of the stator is arranged on the circumference of the stator at positions AEi(i=1, . . . , N) in terms of electrical degrees where different phases of greater than or equal to (NB+2) are located, the amplitude of current phasor of each of the teeth is roughly equal when the entire sum of current phasor of a winding looped through each of the teeth of the stator is represented as current phasor of each of the teeth, a direction of each of said current phasor is roughly coincident with a phase in terms of electrical degrees of positions AEi(i=1, . . . , N) in terms of electrical degrees in a direction of rotor rotation where each of the teeth is located, N is the number of teeth, taking a position in a direction of rotor rotation of each of the teeth of the stator as AE in terms of electrical degrees, the electrical degrees AE or (AE−180°) of each of the teeth is located at a position equally divided by the number of an integer NSK between 0° and 180° and the rotor and the stator are relatively skewed by an angle roughly equal to (180°/NSK) or an angle being an integral multiple of the (180°/NSK).